Let x be the number of $12 dvds sold. with this the number off $10 dvds sold is 200 - x. the equation that best represent the given above is, 12x + 10(200 - x) = 2200 the value of x is equal to 100. therefore, the number of $12 dvds sold is 100.
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Giving if you actually checked and didn t guess is this correct?...